F01L 13/00
Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or
Official title: Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
F01L13/00 (Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or) appears on 4,281 US grants and 3,640 published applications in this corpus.
Search patents in F01L- Granted patents
- 4,281
- Published applications
- 3,640
- Assignees
- 528
- Inventors
- 4,590
- Latest grant
- 29 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 7 | 0 |
| 1977 | 8 | 0 |
| 1978 | 8 | 0 |
| 1979 | 19 | 0 |
| 1980 | 21 | 0 |
| 1981 | 18 | 0 |
| 1982 | 16 | 0 |
| 1983 | 24 | 0 |
| 1984 | 29 | 0 |
| 1985 | 34 | 0 |
| 1986 | 28 | 0 |
| 1987 | 35 | 0 |
| 1988 | 30 | 0 |
| 1989 | 26 | 0 |
| 1990 | 28 | 0 |
| 1991 | 32 | 0 |
| 1992 | 43 | 0 |
| 1993 | 40 | 0 |
| 1994 | 42 | 0 |
| 1995 | 44 | 0 |
| 1996 | 47 | 0 |
| 1997 | 69 | 0 |
| 1998 | 63 | 0 |
| 1999 | 53 | 0 |
| 2000 | 66 | 0 |
| 2001 | 88 | 38 |
| 2002 | 118 | 121 |
| 2003 | 128 | 131 |
| 2004 | 118 | 147 |
| 2005 | 132 | 210 |
| 2006 | 180 | 186 |
| 2007 | 164 | 206 |
| 2008 | 150 | 186 |
| 2009 | 114 | 216 |
| 2010 | 143 | 177 |
| 2011 | 163 | 130 |
| 2012 | 158 | 127 |
| 2013 | 121 | 111 |
| 2014 | 125 | 135 |
| 2015 | 150 | 154 |
| 2016 | 109 | 181 |
| 2017 | 136 | 212 |
| 2018 | 187 | 203 |
| 2019 | 209 | 174 |
| 2020 | 231 | 157 |
| 2021 | 143 | 127 |
| 2022 | 131 | 102 |
| 2023 | 76 | 62 |
| 2024 | 85 | 66 |
| 2025 | 69 | 52 |
| 2026 | 23 | 29 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- F01L 13/0015Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or2,642
- F01L 13/0005Deactivating valves1,232
- F01L 13/06Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or760
- F01L 2013/10Auxiliary actuators for variable valve timingIndexing code447
- F01L 13/08Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or256
- F01L 2013/11Sensors for variable valve timingIndexing code82
- F01L 13/02Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or24
- F01L 13/04Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or10
Recent patents
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- Engine13 Aug 2026US 2026/0235053 A1Ishikawa Energy Research Co., Ltd.
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Most cited
By later US patents
- System for controllably disabling cylinders in an internal combustion engine206US 6,619,258 B2Delphi Technologies, Inc. · 2003
- Programmed valve system for internal combustion engine169US 4,009,695 A1977
- Finger follower rocker arm with engine valve deactivator136US 5,544,626 AFord Motor Company · 1996
- Vehicle operating method and system115US 6,223,846 B12001
- System for controlling a valve mechanism for an internal combustion engine104US 5,398,502 AFuji Jukogyo Kabushiki Kaisha · 1995